For the general case, the n-gon, you got

degrees. The 13-gon thus has 1980 degrees in total.
Answer:
the jar will last for 15 days
It is equal to. I think its because the zeros don't count
Answer:
5/8 or 41/8
Step-by-step explanation:
If you mean 1/8 x 5, then that equals 5/8
If mean 1/8 + 5, then that equals 41/8